General Pump 47200074 Pump Rail Set 1 3/8" - 1904

Vibration-Free Support for Triplex and Plunger Pumps

The Pump Rail Set 1 3/8" lifts your triplex plunger pump 1 3/8" (35mm) above the frame surface, aligning the pump shaft centerline with your engine or motor output shaft. This matched pair of mounting rails stabilizes pumps like the Centurion 4 GPM and General Pump TSF/TSP models on frames, skids and trailers, and provides a solid interface between the pump and equipment frame.

The bottom line is simple: mounting rails reduce unwanted pump movement and vibration, keep coupling angles within spec at 3,400 RPM and prevent bearing and seal wear from a misaligned drivetrain. Each pump needs two rails; one under each set of mounting feet so the crankcase sits level and square on the frame.

Why You'll Love the Pump Rail Set 1 3/8"

A properly mounted pump lasts longer, runs quieter and costs less to maintain. These rails handle the basics so you can focus on the job instead of chasing vibration problems or replacing couplings every few months.

• Solid pump mounting – 1 3/8" height matches common triplex pump feet and standard 1" hollow-shaft engine centerlines. Pump crankcase sits level and auto coupling between engine and pump stays straight rather than fighting an angle load.

• Less vibration, less wear – A rigid pump rail distributes the pump's weight and torque across the full length of the frame. At 3,400 RPM even a few thousandths of an inch of misalignment accelerates seal and bearing wear. Proper alignment prevents premature wear on pump components.

• Faster installs and swaps – Uniform rail height and a drill friendly profile makes pump removal and replacement quicker during maintenance or upgrades. Rails can simplify pump installation and maintenance, reduce downtime between jobs.

• Works with pro-grade pumps – 1 3/8" rail kit fits pumps in the 3–5 GPM range up to 4,000 PSI, including the Centurion 4 GPM pressure washer pump and multiple General Pump models.

• Built for daily use – Rails are made from heavy-duty, corrosion resistant materials for outdoor rigs, wash bays and chemical exposed environments like agricultural sanitation stations.

• Clean, professional setup – A matched rail set keeps the pump square on the skid, makes hose routing easier and your rig looks like it was built by someone who knows what they're doing.

What Makes This Pump Rail Set 1 3/8" Different:

Generic angle-iron mounts, stacked spacers and random brackets might hold a pump in place for a while. But uneven height, twisting under load and inconsistent cross-sections introduce misalignment that chews through couplings and seals. A dedicated rail set built to a specific height solves these problems at the source.

• Precisely matched 1 3/8" profile – The General Pump 47200074 is 1 3/8" high, designed to pair with common triplex pump feet and 1" hollow-shaft engine centerlines. Verify the 1 3/8" measurement refers to rail height for your setup; no shims or guesswork required. The 47200074 is a genuine OEM part for proper fit.

• Engineered for high-pressure duty cycles – The cross-section is thick enough to resist torsion and flex when the pump delivers 4 GPM at up to 4,000 PSI. Budget rails flex under load; these hold steady.

• Better pump-to-engine alignment – Consistent rail height reduces side-load on couplings, prolongs the life of pumps like the Centurion 4 GPM and its drive engine. Verify rail height and bolt spacing matches the pump model before drilling.

• Corrosion and chemical resistance – Coated or galvanized steel resists detergents, moisture and outdoor exposure. Bare steel rails rust at bolt holes within weeks in a wet environment; these don't.

• Retrofits and new builds – The rail set works whether you're upgrading an existing frame or building a new skid or trailer mounted washing system from scratch.

How the Pump Rail Set 1 3/8" Works:

Installation is easy for anyone with a drill, tape measure and wrench set.

1. Position the rails on your frame – Place the two 1 3/8" rails parallel on the machine frame or skid, spaced to match the bolt pattern of the pump feet. Align the rails so the pump shaft centerline will meet the engine output shaft.

2. Secure the rails – Drill and bolt the rails to the frame with grade-5 or stainless fasteners. Rails should sit flat with zero rocking or flex; if the frame is warped, fix that first.

3. Mount the pump – Set the pump (Centurion 4 GPM, General Pump TSF/TSP, etc.) onto the rails. Line up all mounting holes and secure each foot. Each pump requires two General Pump 47200074 rails to support all mounting feet.

4. Check alignment – Use a straight edge or feeler gauge to verify the engine shaft and pump shaft are coaxial. At 3,400 RPM, allowable misalignment is typically under 0.005 inches. Adjust rail position if needed, then tighten all fasteners in a gradual pattern to avoid soft foot.

5. Test under load – Run the pump at operating speed with the trigger open. Listen for unusual noise, watch for vibration, and check for movement at the rail-to-frame connection. If vibration appears, recheck foot bolts and shaft alignment before continuing.

Product Details:

Specs for planning and ordering.

• Material / Finish: Steel construction with galvanized, corrosion-resistant finish for wet and chemical environments.

• Height: 1 3/8" (35 mm); this is the critical dimension for pump foot support and shaft alignment. The General Pump 47200074 is 1 3/8" high.

• Length and width: Rails are sized to match common triplex pump footprints. Cross-section width fits standard pump feet.

• Drilling / hole pattern: 47200074 rail fits TSF and TSP pumps. Can be drilled to fit other common pump footprints like Centurion 4 GPM and General Pump 66 Series.

• Compatibility: 3–5.5 GPM pressure washer pumps, triplex plunger pumps with 1" hollow shaft, industrial washdown pumps on gasoline engines (389–420 cc) or electric motors. Pump rail fits several pump models across these categories.

• Quantity included: A set includes two 1 3/8" pump rails. Mounting bolts, washers are included.  Each pump requires 2 General Pump 47200074 rails.

• Mounting orientation: Rails mount on flat plate skids, channel frames or tubular frames with appropriate hardware.

Who the Pump Rail Set 1 3/8" Is For:

This rail set is for anyone building or upgrading a pressure-washing or industrial pumping rig who wants their pump mounted right the first time.

Professional pressure washing contractors run truck- or trailer-mounted rigs with pumps like the Centurion 4 GPM for concrete cleaning, building exteriors and fleet washing. A matched pump rail set eliminates the guesswork of custom spacers and gets the rig running faster.

Fleet and facility managers operating permanent wash bays and equipment cleaning stations need pumps that stay put through hundreds of daily cycles. Secure, vibration-free mounting means fewer unplanned shutdowns and less coupling replacement.

Agricultural and ranch operations expose pumps to mud, chemicals and constant vibration from portable skids or tractor-mounted setups. Corrosion-resistant rails hold up where bare steel brackets fail within a single season.

Small industrial and manufacturing sites use plant washdown and process-rinse systems where stable mounting reduces downtime. A pump that walks off its mount during a shift is a safety and productivity problem.

DIY builders and rig fabricators benefit from a factory-spec 1 3/8" rail set that aligns engines and pumps correctly without custom-machining spacers. If you can drill holes and turn a wrench, you can get a professional-quality mount.

FAQs:

Do I really need two pump rails for one pump?

Yes. Most triplex pumps, including the Centurion 4 GPM and similar models, have two sets of mounting feet. Each pump requires two General Pump 47200074 rails so all feet are fully supported and the pump sits level. Using a single rail or mixed spacers twists the pump housing and shortens seal, bearing and coupling life.

Will a 1 3/8" pump rail set work with my existing engine or motor?

The 1 3/8" height is designed for 1" hollow-shaft pumps with 389–420 cc gasoline engines running at 3,400 RPM. Measure your crankshaft centerline height from the frame and verify the pump feet plus rail height line up with your coupling or direct-drive requirements. The 47200074 rail fits multiple pump models including TSF and TSP but always check bolt spacing before ordering.

Can I use this rail set outdoors and in wet environments?

Yes. The rails are good for outdoor rigs, wash bays and agricultural sites. To maintain them, rinse off harsh chemicals after use, inspect for rust at bolt holes periodically and touch up exposed metal if the coating gets scratched or chipped.

How hard is installation?

Anyone who can drill, measure and bolt components to a frame can do it. Dry-fit the pump and engine first to verify alignment before drilling final mounting holes. The whole process; positioning, drilling, mounting and alignment checking; takes about an hour with basic shop tools.

What if my pump isn't perfectly aligned on the rails?

Misalignment at 3,400 RPM causes noisy operation, excessive vibration and premature wear on couplings, seals and bearings. Check alignment with a straight edge or feeler gauge. If the pump sits slightly off, shim the low foot rather than forcing the coupling. The 1 3/8" rails handle the bulk of the leveling; fine adjustments cover the rest.

Ready to Build a Solid Pump Mount?

An expensive pump deserves better than angle iron and hope. Pump rail sets provide a solid interface between the pump and equipment frame, keeping your Centurion 4 GPM or similar high-pressure triplex pump aligned, stable and running at full output for years. Add the Pump Rail Set 1 3/8" to your cart and build your rig on a foundation that won't let you down.